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