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