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