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)(23,31)(24,28)(25,29)(26,36)(27,30)(32,34)(33,35) involution — undirected(5,7,11,10)(6,12,14,15)(8,18,9,16)(13,20,17,19)(21,23,26,28,27,33,25,32)(22,24,29,31,30,34,36,35)(1,2,3,4)(5,8,11,9)(6,13,14,17)(7,16,10,18)(12,19,15,20)(21,24,27,34)(22,28,30,32)(23,29,33,36)(25,35,26,31)(5,9,11,8)(6,13,14,17)(7,16,10,18)(12,20,15,19)(21,25,27,26)(22,29,30,36)(23,32,33,28)(24,31,34,35)(5,10,11,7)(6,12,14,15)(8,18,9,16)(13,19,17,20)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.