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