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