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