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