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