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