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