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