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