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