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