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