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