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