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)(15,19)(16,20)(17,18)(21,22,26,27)(23,28,29,24)(25,33,34,30)(31,32,36,35)(5,6,8,9)(7,11,12,10)(13,15,17,20)(14,16,18,19)(22,27)(23,29)(25,34)(32,35)(6,9)(10,11)(14,18)(16,19)(21,23)(22,28)(24,27)(25,31)(26,29)(30,35)(32,33)(34,36) involution — undirected(1,2)(3,4)(5,6)(7,11)(8,9)(10,12)(13,16)(14,15)(17,19)(18,20)(21,24,26,28)(22,29,27,23)(25,35,34,32)(30,31,33,36)(5,7,8,12)(6,10,9,11)(13,15)(14,19)(16,18)(17,20)(21,25)(22,30)(23,31)(24,32)(26,34)(27,33)(28,35)(29,36)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.