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