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