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