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)(21,22,27,30,26,29,24,34)(23,25,33,36,32,28,31,35)(5,7,9,15)(6,10,12,13)(8,16,17,14)(11,19,20,18)(21,23,26,32)(22,28,29,25)(24,31,27,33)(30,35,34,36)(2,4)(22,29)(23,32)(30,34)(31,33) involution — undirected(5,8,9,17)(6,11,12,20)(7,14,15,16)(10,18,13,19)(21,24,26,27)(22,30,29,34)(23,33,32,31)(25,35,28,36)(6,12)(10,13)(11,20)(18,19)(21,25,27,36,26,28,24,35)(22,31,30,23,29,33,34,32)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.