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