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