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)(13,14)(15,16)(17,18)(19,20)(22,26)(24,32)(27,29)(30,33) involution — undirected(8,12)(10,11)(14,18)(15,20)(21,22,25,26)(23,29,31,27)(24,28,32,34)(30,36,33,35)(6,7)(10,11)(15,20)(16,19)(21,23,25,31)(22,27,26,29)(24,33,32,30)(28,36,34,35)(1,2)(3,4)(5,7,9,6)(8,11,12,10)(13,15)(14,19)(16,18)(17,20)(21,22)(23,29)(24,28)(25,26)(27,31)(30,36)(32,34)(33,35)(5,8)(6,10)(7,11)(9,12)(13,16,17,19)(14,15,18,20)(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.