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