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