One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,13)(6,7)(8,9)(10,14)(11,15)(12,16)(19,25)(23,26)(27,31)(30,32)(33,34)(35,39)(36,42)(37,45)(38,40)(41,47)(43,44)(46,48) involution — undirected(2,7)(4,8)(5,14)(11,16)(17,18)(19,23)(20,28)(21,22)(24,29)(25,26)(27,32)(30,31)(33,35,38,42)(34,39,40,36)(37,46,47,43)(41,44,45,48)(2,7)(3,9)(10,13)(11,16)(18,22)(23,26)(24,28)(30,32)(34,40)(35,42)(41,45)(43,46) involution — undirected(1,3)(2,8)(4,7)(5,11)(6,9)(10,15)(12,13)(14,16)(17,18)(19,26)(20,24)(21,22)(23,25)(27,32)(28,29)(30,31)(33,34)(35,39)(36,42)(37,41)(38,40)(43,48)(44,46)(45,47) involution — undirected(1,4,6,8)(2,9,7,3)(5,12,14,15)(10,16,13,11)(17,19)(18,23)(20,27)(21,25)(22,26)(24,30)(28,32)(29,31)(33,36,38,39)(34,35,40,42)(37,44,47,48)(41,43,45,46)(1,5,6,14)(2,10,7,13)(3,11,9,16)(4,12,8,15)(17,20)(18,24)(19,27)(21,29)(22,28)(23,30)(25,31)(26,32)(33,37)(34,41)(35,43)(36,44)(38,47)(39,48)(40,45)(42,46)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.