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