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