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