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