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