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