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