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