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