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