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