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