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