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