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