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