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