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