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