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