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)(21,22,26,29,25,30,27,31)(23,32,34,36,33,28,24,35)(6,9)(7,11)(13,15)(14,17)(16,19)(18,20)(21,23)(22,28)(24,27)(25,33)(26,34)(29,35)(30,32)(31,36) involution — undirected(2,4)(15,19)(17,20)(21,24,25,34)(22,28,30,32)(23,26,33,27)(29,36,31,35)(5,7,8,11)(6,10,9,12)(22,29)(23,33)(26,27)(28,36)(30,31)(32,35)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.