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