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