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