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