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