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