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