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