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