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)(23,29)(24,26)(25,32)(27,30)(28,34)(31,35)(33,36)(5,6,8,9)(7,10,11,12)(22,24)(23,30)(28,32)(31,33)(7,11)(10,12)(13,14)(15,17)(16,18)(19,20)(21,23)(22,27)(24,29)(25,33)(26,30)(28,36)(31,34)(32,35) involution — undirected(1,2)(3,4)(5,6)(7,10)(8,9)(11,12)(13,15,16,20)(14,17,18,19)(21,24,26,22)(23,29,30,27)(25,32,34,28)(31,36,33,35)(5,7,8,11)(6,10,9,12)(21,25)(22,28)(23,31)(24,32)(26,34)(27,35)(29,36)(30,33)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.