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