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