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