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