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