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