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