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