One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,6,7)(3,9,11,4)(5,8,14,15)(10,13,16,12)(17,18,23,25)(19,22,20,24)(21,26,30,32)(27,29,28,31)(33,34,38,36)(35,39,41,42)(37,40,46,44)(43,47,45,48)(2,7)(4,9)(8,15)(12,13)(17,19,23,20)(18,24,25,22)(21,28,30,27)(26,29,32,31)(35,41)(39,42)(43,45)(47,48)(18,25)(19,20)(26,32)(27,28)(33,35)(34,39)(36,42)(37,43)(38,41)(40,47)(44,48)(45,46) involution — undirected(1,3)(2,4)(5,10)(6,11)(7,9)(8,12)(13,15)(14,16)(17,20,23,19)(18,22,25,24)(21,28,30,27)(26,29,32,31)(33,36,38,34)(35,42,41,39)(37,44,46,40)(43,48,45,47)(1,4)(2,3)(5,13)(6,9)(7,11)(8,16)(10,15)(12,14)(17,21)(18,26)(19,27)(20,28)(22,29)(23,30)(24,31)(25,32)(33,35)(34,39)(36,42)(37,45)(38,41)(40,48)(43,46)(44,47) involution — undirected(1,5,6,14)(2,8,7,15)(3,10,11,16)(4,12,9,13)(17,22)(18,19)(20,25)(21,29)(23,24)(26,27)(28,32)(30,31)(33,37)(34,40)(35,43)(36,44)(38,46)(39,47)(41,45)(42,48)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.