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