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