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