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)(23,27)(24,28)(25,30)(26,29)(31,34)(32,35)(33,36) involution — undirected(1,2,4,3)(5,6,8,9)(7,10,11,12)(13,14,16,17)(15,18,19,20)(21,23,31,33,26,24,25,32)(22,27,34,36,29,28,30,35)(2,3)(7,11)(10,12)(13,15)(14,18)(16,19)(17,20)(21,24,26,23)(22,28,29,27)(25,32,31,33)(30,35,34,36)(1,3,4,2)(5,7,8,11)(6,10,9,12)(15,19)(18,20)(22,29)(27,28)(30,34)(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.