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