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