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)(21,22,25,28)(23,26,30,34)(24,31,32,27)(29,35,36,33)(6,9)(10,12)(14,17)(18,20)(21,23,25,30)(22,26,28,34)(24,29,32,36)(27,33,31,35)(7,11)(10,12)(13,14,16,17)(15,18,19,20)(21,22)(23,26)(24,27)(25,28)(29,33)(30,34)(31,32)(35,36)(1,2)(3,4)(5,6)(7,12)(8,9)(10,11)(21,23)(22,26)(24,29)(25,30)(27,33)(28,34)(31,35)(32,36) involution — undirected(5,7)(6,10)(8,11)(9,12)(13,15,16,19)(14,18,17,20)(21,24,25,32)(22,27,28,31)(23,29,30,36)(26,33,34,35)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.