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