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