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