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