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