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