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