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