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