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