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