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