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