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