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