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