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