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