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