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